diff --git a/hash.c b/hash.c
index cf19cdb5e6..7ef30b43bc 100644
--- a/hash.c
+++ b/hash.c
@@ -6501,25 +6501,11 @@ static VALUE
 env_clone(int argc, VALUE *argv, VALUE obj)
 {
     if (argc) {
-        static ID keyword_ids[1];
         VALUE opt, kwfreeze;
-
-        if (!keyword_ids[0]) {
-            CONST_ID(keyword_ids[0], "freeze");
-        }
-        rb_scan_args(argc, argv, "0:", &opt);
-        if (!NIL_P(opt)) {
-            rb_get_kwargs(opt, keyword_ids, 0, 1, &kwfreeze);
-            switch (kwfreeze) {
-              case Qtrue:
+        if (rb_scan_args(argc, argv, "0:", &opt) < argc) {
+            kwfreeze = rb_get_freeze_opt(1, &opt);
+            if (RTEST(kwfreeze)) {
                 rb_raise(rb_eTypeError, "cannot freeze ENV");
-                break;
-              default:
-                rb_raise(rb_eArgError, "invalid value for freeze keyword");
-                break;
-              case Qnil:
-              case Qfalse:
-                break;
             }
         }
     }
diff --git a/internal/object.h b/internal/object.h
index 2af90c1fdc..512c367b77 100644
--- a/internal/object.h
+++ b/internal/object.h
@@ -42,6 +42,7 @@ void rb_obj_copy_ivar(VALUE dest, VALUE obj);
 VALUE rb_false(VALUE obj);
 VALUE rb_convert_type_with_id(VALUE v, int t, const char* nam, ID mid);
 VALUE rb_obj_size(VALUE self, VALUE args, VALUE obj);
+VALUE rb_get_freeze_opt(int argc, VALUE *argv);
 MJIT_SYMBOL_EXPORT_END
 
 static inline void
diff --git a/object.c b/object.c
index 244f2a6bba..1994fe9b80 100644
--- a/object.c
+++ b/object.c
@@ -369,7 +369,6 @@ init_copy(VALUE dest, VALUE obj)
     }
 }
 
-static VALUE freeze_opt(int argc, VALUE *argv);
 static VALUE immutable_obj_clone(VALUE obj, VALUE kwfreeze);
 static VALUE mutable_obj_clone(VALUE obj, VALUE kwfreeze);
 PUREFUNC(static inline int special_object_p(VALUE obj)); /*!< \private */
@@ -418,12 +417,12 @@ rb_obj_clone2(rb_execution_context_t *ec, VALUE obj, VALUE freeze)
 VALUE
 rb_immutable_obj_clone(int argc, VALUE *argv, VALUE obj)
 {
-    VALUE kwfreeze = freeze_opt(argc, argv);
+    VALUE kwfreeze = rb_get_freeze_opt(argc, argv);
     return immutable_obj_clone(obj, kwfreeze);
 }
 
-static VALUE
-freeze_opt(int argc, VALUE *argv)
+VALUE
+rb_get_freeze_opt(int argc, VALUE *argv)
 {
     static ID keyword_ids[1];
     VALUE opt;
@@ -657,9 +656,10 @@ static VALUE
 rb_obj_init_clone(int argc, VALUE *argv, VALUE obj)
 {
     VALUE orig, opts;
-    rb_scan_args(argc, argv, "1:", &orig, &opts);
-    /* Ignore a freeze keyword */
-    if (argc == 2) (void)freeze_opt(1, &opts);
+    if (rb_scan_args(argc, argv, "1:", &orig, &opts) < argc) {
+        /* Ignore a freeze keyword */
+        rb_get_freeze_opt(1, &opts);
+    }
     rb_funcall(obj, id_init_copy, 1, orig);
     return obj;
 }